| 摘要 |
PURPOSE:To perform accurate air-fuel ratio control irrespective of changes in atmospheric pressure by detecting the atmospheric pressure, calculating a compensation factor for compensating escape of fresh intake according to the detected value, and compensating a fuel supply rate, thereby compensating the escape of the fresh intake. CONSTITUTION:A 2-cycle internal combustion engine 1 or the like having a large escape ratio of fresh intake is provided with a means 2 for supplying a required rate of fuel to the engine 1 and a means 3 for calculating a fuel supply rate determined by operating conditions such as load and rpm of the engine 1. A means 4 for detecting atmospheric pressure and a means 5 for calculating a compensation factor for compensating the escape of the fresh intake according to the detected atmospheric pressure and for compensating the fuel supply rate calculated with the means 3 are also provided. A means 6 is further provided for forming a fuel supply signal to be sent to the means 2 so that a corrected rate of fuel is supplied to the engine 1. This compensates the escape of the fresh intake accurately irrespective of changes in the atmospheric pressure.
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